Gun-catapult mechanism



June 26, 1962 F. w. sli-:VE ET AL GUN-CATAPULT MECHANISM Original FiledMarch 29, 1956 5 Sheets-Sheet 1 INVENTORS FRA/VK m SIEVE PETERl JOSEPHOLENIGK, Jr.

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Q2/30mm ATTORNEYS June 26, 1962 F. W. SIEVE ET AL GUN-CATAPULT MECHANISM5 Sheets-Sheet 2v Original Filed March 29, 1956 M w m m x, m m mm .O wmL A.. 1 w A mm n mg sxm m# MMD w, fw 5 FEM June 26, 1962 F. w. sxEvE ETAL 3,040,628

AAAAAAAAAAAAAAAAAAA SNI 1 :Sl i 111' l June 26, 1962 F. W. SIEVE ET AL3,040,628

GUN-CATAPULT MECHANISM Original Filed March 29, 1956 5 Sheets-Sheet 5INVENTORS` a AM,

' ATTORNEYS PETER JOSEPH OLEN/CK, Jr. DAV/0 OLEO/W3 FW'L FRA/VK- W.SIEVE 3,040,628 GUN-CATAPULT MECHANISM Frank W. Sieve, Falls Church,Va., Peter lloseph fiieniclr, Jr., Washington, D.C.,` and David CleonisFowler, Silver v Spring, Md., assignors to the United States of Americaas represented by the Secretary of the Navy 'Continuation of applicationSer. No. 574,938, Mar. 29, 1956. This application May 29, 1956Ser. No.53%,199

7 Claims. (Ci. 89-1) 4 (Granted under Title 35, US. Code (1952), sec.266) The invention described herein may be manufactured and used by orfor the Government of the United States of America for governmentalpurposes without the payment of any royalties thereon or therefor.

The present application is a continuation of copending applicationSerial No. 574,93 8, filed March 29, 1956, for Gun-Catapult Mechanism,and nowv abandoned.

The present invention relates to a gun-catapult mechanism and moreparticularly relates to high-low power drive apparatus for projecting adriver down a barrel while providing maximum safety to' personnel andmechanism and maint-aining'maximum rigidity and strength with minimumWeight and minimum necessary strength characteristics in the safetyfeatures.

Prior art guns and prior art catapults have the disadvantage of inherentdanger to personnel, lack force mul- 3,940,628 Patented .inne 26, 1962Other objects and many of the attendant advantages ofthis invention willbe readily appreciated as the same becomes better understood byreference to the following detailed descn'ption when .considered inconnection with the accompanying drawings wherein:

FIG. 1 is a side elevationaliview ofa preferred embodiment of the casingand gun-catapult; mechanism of the invention in ysafe position ywithparts broken away to.

better show certain features of the mechanism;

FIG. 2 is an elevational view of the apparatus of FIG. l with safetyfeatures omitted to lend clarity to the drawing and showing the splinedriver in ejected position;

FIG. 3`is a cross-sectional View taken in the direction of the arrows 33 of FIG. 1;

FIG. 4 is a cross-sectional view taken in the direction ofthe arrows4--4 of FIG. 9 and showing the mechanism of FIG. 3 upon rotation toarmed position;

FIG. S is'an enlarged side elevational view showing a portion of thedevice of FIG. 1 with further portions broken away to better illustratethe escape ports and actuator mechanism;

FIG, 6 is a cross-sectional view taken along the line 6 6 of FIG. 5 andshowing alignment of grooves and escape ports;

FIG. 7I isa cross-sectional view taken along the line 7 7 of FIG. Sandshowing alignment of barrel and Adriver grooves;

FIG. 8 is a view similar to the showing in FIG. 5 illustrating in detailthe escape path upon accidental explosion in safe position of the safetythread mechanism;

FIG. 9 is a side elevational view of a portion of the device ofl FIG. lwith certain parts broken away to better accurate, and lightweightapparatus for performing the functions of the inventive device.

-Accordingly, an object of the invention is to provide a gun-catapultmechanism which will incorporate features of -force multiplication,safety, and simplicity of mechanical operation while retaining featuresof light- -ness of weight, accuracy and absolute reliability.

Another purpose of the invention 'is to provide a guncatapult mechanismwhich will provide for features of high-low power drive operation.

Another aim of the inventionis to provide safety apparatus for powerdrive mechanisms wherein a driver maybe forced downv a barrel in amanner to provide acceleration of the driver and to insure maximumreliability of operation whenneeded.

Another object of the invention is to provide for ejectment of a driverdown va casing or barrel in a manner to provide both maximum driving andmaximum catapult action combined with utmost safety andv reliability inoperation.

Another purpose 4of the 'invention is to provide for acceleration meansto accelerate a propelled missile along a contoured container wherein anexploded charge may provide propelling force which propelling force isforce multiplied'andyet which will operate only at desired predeterminedtimes and wherein the equipment will be of minimum weight, maximumeconomy, and will beprovided with features of absolute safety,reliability in service, and avoid possibility of casualties causinginjury to personnel and to the equipment.

Another object of the invention is to provide fora vgun-'catapultmechanism which will operate only'when all parts are properly alignedand will have a safety mechanism which possesses maximum safetyfeatures,A strength, and rigidity'in all instances Where accidentalfiring or ejectment is to he avoided.

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vcatapult launching means of the inventive gun catapult shown disposedat the forward extremity of the barrel.

Referring more particularly to the drawings the guncatapult of thepresent invention'is shown in the illustrative embodiment generally at21. A casing or barrel 22 is splined partially along its length for apurpose to be describe/d. Toward the rearwardly disposed end of thebarrel 22 an explosion chamber 23 may be contained in smooth boredsection 2 4 -of the casing or barrel 22. In this chamber may be placedan explosive charge (not numbered). Disposed forwardly of the explosioncharnber 23 may be a frangible disk spacer member 25 designed todisintegrate upon explosion of the explosive material in explosionchamber 23. Forwardly of the frangible -disk spacer 25 may be a normallyunpressurized second explosion chamber 26, Upon explosion of Itheexplosive material' in explosion chamber 23 the shock or.- pressure willbe transmitted to air or other gaseous particles kin the secondexplosion chamber 26. Radially outward from .pressure chamber 26 mayextend escape ports 2.7 for a purpose tobe described. Forwardly of thepressure chamber 26 may be a low piston chamber 23, a tapered wallchamber29' anda high piston chamber 34.` Disposed further forwardly ofthe piston chambers 23, 29, 34 may be an unsplined chamber 3i) bored,un-

vdercut or otherwise machined in casing 22. Chambers 23, 26, 28, 2.9, 34and therecess for disk 25 may be formed in barrel 22 by machiningv atthe time of forming the .barrel bore or as vshown in FIG. '2 a liner orliners (not numbered) maybe inserted in the unsplined portion of barrel22 havinginner contours to dene these chambers. y Chambers 28, 29' and34 could also be formed by. the bushing 68` as shown. In normal unredcondition disposed in the low or small area piston chamber yand 2 of thedrawings.

acariens 28 is the low piston member 32, a. taper portion (not numbered)is disposed inthe taperedk aperture andthe high or large area pistonmember r33 lrigidly attachedr to or integral with .the low piston member32 is disposed in f chamber 34. -Disposed forwardly of high pistonmember 33 is a sp1-ined ldriver member `60 whichy iny normal nnredposition may abut against the piston member 33.r From the forward end of`splined driver tlin-unred position to the kopen end of the casing 57the casing or barrel 22 may be splined las ybest shown inFIGS. l.

between splines 35 of the splinedl driver 60. At the forward extremityof splined driver 60 lwhen driver 60 is in untiredk position lis thestart .of easingy spline members 36 which are disposed along casing 22to the forward end 57 thereof. Alternating with the casing splines. 36yare lcasing grooves 37, and .thegrooves and splines y may beequiangularly. radiallydisposed with respectto the center of thecasingand may be disposed adjacent the inner bored surface roflthecasing or. barrel 22. In-v yterposed between the. splines 35ofsplineddriver 60are the splined driver grooves 33. p p f 'As 'best'shown in HG. 10 an actuator generally designated at 39 may be screwedtransversely and normally to the cylindrical portion of gun barrel 22 bymeansof y n lthread members 45.- The gunv barrel may have mating v`threads v(not shown).l Actuator assembly. 39 may corn-l l prise a screwthreaded pin- 40 having a lower head 47 and a roller member 4S.yScrewthreaded on safety pin 40 and disposed circumferentiallyvtherearound lmay bel a rotatable sleeve member 58. having integrally orother driverl motor 44:. Disposed ralong'safety pin 40 may be t a slotand retaining key assembly 46 so that upon rota tion of motor 44 causingits output shaft. 43 to rotate in .l .turn causing pinion 41y to drivegear 42 the safety pin member `40 may be kcaused to advance or retard inAaccordance `with thedirection ofrotationof output shaft 43 to plunge;safety pin member 40 into and out of the casing. or barrel 22.Plungingthe safety pin member 40 l `into the casing 22 and splineddriver 60 places the pin in engaged position. Motor 44 may be actuatedby electrical signals, by remote control, by'mechanical or hydraulicmeans, or otherwise in ways conventional in the art.

As best shown in FIG. 3 in safe position of the safety pin 40, rollerlili will be disposed in position at the inner 1 end of a slot 50 suchthat splines 35 of splined driver 60 will be aligned directly behind thespline portions 36 of the splined portion 31 of casing or barrel 22. Inthis position the spline driver 60 is prevented from movinglongitudinally with respect to the barrel or casing 22 because of theabutmentstopping -action of the splines 36 of portion 3l of the casingor Abarrel 22 upon splines 3'5 of spline driver 60 which are then inlongitudinally aligned position. Upon retraction of safety pin member 40and its roller member 48, roller member 48 will bear against cam surface49 of slot 50 it beingn close fitting relationship between the camsurfaces 49 Iand 52. This will cause rotation of the spline driver 60such thatY it will then assume the aligned position best shown in FIG. 4of the drawings. When in such aligned position spline members 35 ofsplined driver 60 are in alternate spaced radial relation with respectto spline members 36 of portion 31 of the gun barrel, the spline members35 are then longitudinally .aligned with barrel grooves 37 and thesplined driver 60. is free to travel longitudinally along the splinedportion 31 of the barrel 22. Either integrally attached to or otherwisefastened to splined "driver 60 may be a reduced shaft portion 61 whichwill travel with the splined driver 60. Attached to reduce shaft portion61 may be a sleeve member 62 adapted to The casing splines 36 `may be vin. dimensional mating'relationship withthey grooves 38 i :bebearingly'tted'over barrel 22 to slide therealong for the length oftravel of the splined driver tland supported reduced shaft portion 61.`'Rigidly'attached to the sleeve member 62 Amay' be; extended yalaunching finger 63.

. Launching linger 63 may be disposed through a slot 55 l in a platformv64- of .the launcher generally designated at 56.;k Slot 55 may extendin yplatform 64 throughout the length of travel of launching inger63such that .the

f launching finger may travel therealong a'distance rcorresponding tothe longitudinal ydisplacement of reduced shaft portion 61` on tiring."Launching nger-63 coin l. cident with forward lmotion ofl reduced shaft61 will grooves 38 are aligned with the rcasing grooves 37 ofcascatapult missile 65. yPlatform 64 may be supported by` anyvsupportingmeans vconventional in the art as, for l example, bycantileversupport 66. I As best shownl inFIG. 6 of the drawingswhen in safeunfired position of the driver the grooves 38 of splined driver 60 arein alignment with exitiports 210i normallyunagitated chamber 26 so thatin the event of un`V desired explosion or' premature explosion Athelgases will l be expelled through-the exit ports or escape ports 27 andthrough the drivcrgrooves 3S.' As shown in FIG. 7 of the drawings insafe position ofthe driver 'the driver ing or. barrel-22 such that thevgas will continue *fromy the escape ports 27 through kthe driverlgrooves 38thence .along the Agrooves-37 of barrel 22 to escape throughthe forwardl endl of the barrel.' Appropriate escape apertures 67 may beprovided at the end face ofl sleeve mem-` ber 62 or alternativelythrough thegsidc walls toward the '.forwardi endfof ybarrel 22. Thesebarrel escape ports v may be disposed'justl before the rearward end of.sleeve 62 if it'is desiredto have automatic retraction of the vsplinedriver mechanism 60 in a manner to be presently described.

Operation In sate, unused or unred position asbest shown in FIG.

1 explosion chamber 23; frangible disk spacer 25, empty chamber 26,11owpiston chamber 28 and high piston chamthis position, low piston member32 is disposed in low piston chamber 28 and high piston member 33 isdisposed in high piston chamber 34. Actuator 39 as has been previouslystated is threadedly inserted transversely of the gun barrel 22 and pin40 is in locked position within the gun barrel 22 and splined driver 60and as shown in FIG. 3 roller 48 by action with cam 49 has rotated thesplined driver 6o in position such that the barrel grooves 37, thesplined grooves 38 and the exit ports 2,7 are all aligned to permitready ow of gas from the unagitated chamber 26 through the exit ports 27through the grooves 3S of the splined driver 60 and thence through thebarrel grooves 37 and out through the above-described exit ports at theforward end of the barrel. Should an unwanted explosion occur thepressure introduced into the gases present in chamber 26 will causeejection of the gases through the exit ports 27 thereof and along thebarrel 22 to be safely discharged. With the relatively small amount offorce in this instance on the rearward face of low piston member 32 thesafety pin 40 need be only of suticent strength, rigidity and dimensionssuch -that tiring will not take place. The force exerted on therelatively small face area of low piston member 32 will .not be of suchmagnitude due to the low area `over which the pressure is applied tocause shearing of the safety pin 40, which 4pin therefore need only beof dimensions and material driver transversely with respect to guncasing Z2; Roller 48 Will then ride along cam surface 49and between thatcam surface and cam surface 52 resulting force of roller 48 applied tocam surface 49 causing rotation of the driver spline such that itassumes the armed position shown in FIG.'4 wherein the spline portions35 of the splined driver 60 are aligned pwith the groove portions 37 ofthe splined section 31 of the casing 22 so that the splined driver isfreeto move along the casing 22 toward the forward end thereof and such.that the ports 27 no longer lead into an open path for expanded gasesout of the forwardend of the barrel 22. The explosive charge 23 is thenignited causingspacer diaphragm 25 to disintegrate or to collapse'andthe chamber 26 then becomes lled with expanding gases. The expandinggases in chamber 26 cause pressure to be transmitted to the-rearwardface of low piston member 32 and to the rearward face of thesplines'of splined driver 60.y Low piston member 32 then no longer beingrestrained by safety pin 45 commences to move yforwardly of the guncasing bearing against the splined driver 60 to cause splined driver 6i)to effect motion along the barrel 22 toward the forward end thereof.Upon motion of the low piston 32 and integral or rigidly attached highpiston member 33 toward the forward end of the barrel 2,2 a chamber thenexists behind the high piston rear end face causing pressure to be alsoexerted against the area .therein which imparts the pressure over atotal greater area causing an increase in force since force pressure=area; and thereby accelerating the splined driver 60 along the bar-rel22 a number of times which is a function of the total area of the highand low piston rear face surfaces v plus the splined driver rear facesurfaces las compared with the low piston rear face surface. The splineddriver and its associated shaft 61 then may ride at an extremely rapidrate toward the forward end of the barrel 22. This imparts a ratherlarge momentum to the shaft portion 6l. which longitudinal motion may inturn be transmitted to lthe catapult mechanism. By means such as sleevemember-62 which may be attached or otherwise driven by the reduced shaftportion 61 the sleeve 62`may be caused t0 move in the direction of theforward end of the barrel 22 at a correspondingly very rapid rate.Launching nger 63 which may be integrally or otherwise rigidly attachedto the sleeve member 62 upon being projected therewith will causecatapulting action upon missile 65. Launching linger 63 may be mountedin a slot 65 dispo-sed in platform member 64 which may serve -to supportthe missile 65. Platform 64 may be supported as for example by means ofcantilever support 66. Resulting action of this operation thereby causescatapulting by the sleeve memberand additional gun barrel action may, ifdesired, be eifected by motion transmitted through means of shaftportion 61 when the splined driver 6th is rapidly moved from a rearwardposition with respect to the barrel 22 to an extreme forward positiontoward end 57. After -iiring and launching which may beeffectedsubstantially sim-ultaneously in the manner shown, return of the driver6i) and its associated sleeve portion 62 may be effected in variousways. For example, spring or other bias means (not shown) may serve toreturn the splined ldriver 60 and attachedintegrated parts and the highand low piston members 28 and 29 into non-firing position. Methods of-recoil or counterrecoil may also be used, for example, one such systemcontemplated would embody a form wherein the end cylindrical wallof'sleeve 62 would be solid and wherein through portlioles inthe gun casingdisposed rearwardly ofv the-sleeve the compressed gas upon flowing downthe gun barrel would be emitted through ports ocour-ring before thebeginning of the sleeve portion at a certain sleeve position. In thismanner compression of the gas disposed between the cylindrical end ofsleeve 62 and the forward portion of the splined driver apparatus wouldtake place. After the pressure is reduced in the after part of thechamber by leakage or by driving of the gas out of the portholes beforesleeve 62, this pressure would then be below the pressure caused bycompression of the gas trapped between the splined driver 60 and the endcylindri- `cal wall of sleeve 62 thus causing a recoil action drivingspline 62 toward its original non-tired position. Another method ofaccomplishingthe recoil to restored initial conditions could be by meansof electrical circuits or by means of a path of the expanding gasesthrough the casing wall and into the space between the splined driverand the end wall of sleeve 62-timed such that upon the end of the stroke`of :the spline shaft the compression chamber thus formed between thesplined driver and the sleeve end would be lled in part with compressedgas which would then serve to return the parts to non-tiring conditionwherein action of the safety pin d@ in response to actuation of motor 44could be synchronized to once again cause safety position and permit gasto oe expanded out of' the end por-tions of the cylinder. In this casethe disk Z5 would be collapsible rather than frangible, Apertures 67 ofcourse are formed in the cylindrical sleeve 62 with opera-tion as shownin the embodiment herein.

Obviously many modifications and variations of the present invention arepossible inthe light of the above teachings. It is therefore to beunderstood that within the scope of the appended claims the inventionmay be practiced otherwise than as 'specifically described.

What is claimed is:

1. Apparatus for providing accelerated movement from a first' positionto a second position said apparatus comprising a cylindrical barrelmember, a splined dri-ver slid- Iably and rotatably supported in saidbarrel member and having a cam slot formed therein, said barrel memberhaving longitudinally disposed parallel splines on its inner surface,said splined driver having longitudinally disposed parallel splines onits outer surface adapted to mate with the grooves varranged between thesplines of said -bar-rel member only when the driver is rotated apredetermined amount, a iirst piston means having a small pressureimpinging area and disposed in said barrel member, a second piston meanshaving a large pressure impinging area and disposed within said. barreladjacent said iirst piston means and Ibet-Ween said first piston meansand said splined driver, said driver being carried by said piston meansand movable thereby, said barrel mem-ber having structure defining achamber to tit said adjacent rst and second piston means in contourreceiving relationship, means to exert pressure against said iirstpiston means to cause longitudinal movement of the splined driver alongsaid barrel after said driver is rotated said predetermined amount,movement of the lirst piston and second piston means Iout of the chamberpermitting exertion of pressure on the face of the second piston meanswhich is adjacent the rst piston means, to thereby multiply the areaover which the pressure is distributed tending to urge the piston meansalong the barrel, thereby pro- Viding greater force on the combinationof first piston means and second piston means to further accelerate thesplined driver in its movement along the barrel, a casing carried bysaid -barrel member, threaded means slid'aibly mounted within saidcasing, means mounted on one end of said threaded means and normally inengagement with said cam slot for releasably locking said splined driverto the b'arrel member-until the Ilocking means is moved within said'camslot from an initial position to a final position, said locking meanscausing rotation of' the splined -driver said predetermined Vamount asthe locking means is moved from the initial position to said finalposition, means rotatably supported within the casing in engagement withsaid threaded means for moving the threaded means slidably an amountsuiliciently to move the locking means from the initial position to saidfinal position, means lrotatably supported within the casing invengagement with said threaded means for moving the threaded meansslidably an Iamount suiciently to move the locking means from theinitial position to said tinal position in response to the rotation ofthe rotatable means, and means disposed within the casing andoperatively connected to said rotatable means for imparting rotarymovement thereto.

2. Means for enlarging the area over which a member has pressure exertedfrom that in `a first nonmoving position to the area over which themember has pressure exerted in a second moving position; said meanscomprising a barrel member, structure in said barrel defining anexplosive chamber disposed in said barrel member, barrel structuredefining a second normally unagitated chamber, a frangible disk memberdividing said explosive chamber from said normally un-agitated chamber,exit ports extending radially outward from said normal unagitatedchamber through the barrel structure, barrel filler structure defining arst low piston receiving chamber and a second high piston receivingchamber, a first relatively sm-all diameter piston member and a secondrelatively large diameter piston member integral with said lirst lowpiston member, the contours of said low piston chamber and high pistonchamber being of size and shape to slidably and bearingly receive saidfirst and second piston members, a splined driver member having aplurality of splines disposed at intervals around its outer periphery,the splined driver being substantially bearingly received in saidbarrel, said barrel having -its inner bore splined lfrom a first endthereof to a position adjacent said driver member when said drivermember is in at rest position, grooves defined by the spaces betweensaid barrel splines, said barrel grooves being of dimensions `and shapeto receive the splines of said driver member when the splines of saiddriver member are longitudinally aligned with said barrel grooves, -saiddriver splines being aligned with said barrel splines when in at restposition, the grooves of said driver member being aligned with thegrooves of said barrel member and with the exit ports from said normallyunagitated chamber when said driver member is in at rest position,thereby providing pressure bypass from the normally unagitated chamberthrough' the barrel, through the grooves of the driver, and through thegrooves of the splined portion of the barrel at times when predeterminedshifting of said driver from the lrst position to the second position isnot to take place, means to rotate said driver member when displacementin its longitudinal position is to take place, rot-ation of said drivermember causing said driver splines to become aligned with said barrelgrooves and causing blocking of the exit ports from said normallyunagitated chamber thereby permitting gas in the 'second chamber uponexplosion to bear against the face of the low piston member,displacement of the low' piston member and the high piston member out ofits chambers permitting the gas under pressure to escape from the secondchamber to bear against the rear surface of said low piston and saidhigh piston member to thereby enlarge the area against which thepressure is directed and hence the total directed force to causeaccelera-tion of the piston members to thereby cause acceleration ofdisplacement of the driver member,

said driver member being displaced by urging of said.

piston members against an end surface of said driving member. i

3. An Iapparatus of the class described comprising a cylindrical barrelmember, a driver slidably Iand rotatably supported on said barrel memberand having a cam slot formed therein, a plurality of rnutuallgI spacedspline elements and grooves formed on the inner surface of said barrelmem-ber, complementary mating mutually spaced spline elements andgrooves formed on the `outer surface of the drive member and normally inlongitudinal alignment with the spline elements and grooves on saidbarrel member, a threaded pin slidably mounted on said barrel member, aroller mounted on one end of said pin and normally in engagement withsaid cam slot for maintain- 8 ing said spline elements and grooves onsaid driver and barrel member in said longitudinal alignment, saidroller being movable through said cam slot from an initial position to afinal position to rotate said driver a predetermined amount to causeregistration of the spline elements on the driver with the grooves onthe barrel member and registration of the spline elements on the barrelmember with the 'grooves on the driver, a sleeve rotatably supported onsaid bar-rel member in threaded engagement with said pin for slidablymoving said pin in response to rotation of the sleeve an amountsufficiently to move said roller through the cam slot from an initialposition to said final position, rotatable means connected to saidsleeve for rotating said sleeve, and means for moving said driverlongitudinal along said barrel member when the driver has been rotatedsaid predetermined amount.

4. A claim in accordance with the device of claiml 3, wherein therotatable means includes a motor having `a shaft driven thereby, adriving connection between the shaft and said sleeve for rotating thesleeve as the shaft is driven by said motor.

5. A claim in accordance with the device of claim 3 wherein therotatable means includes e. motor having a shaft driven by the motor, Iagear carried on one end of said shaft and rotated thereby as the shaftis driven by the motor, a complementary gear carried on one end of saidsleeve in engagement with said gearon the shaft and driven thereby forrotating said sleeve.

6. An apparatus of the class described comprising a cylindrical barrelmember, a driver slidably and rotatably supported on said barrel memberIand having a cam slot formed therein, Ka plurality of mutually spacedspline elements and grooves formed on the inner surface of said barrelmember, complement-ary mating mutually spaced spline elements andgrooves formed on the outer suriiace of the driver and normally inlongitudinal alignment with the spline elements and grooves on saidbarrel member to prevent longitudinal movement of said driver along saidbarrel member until said driver has been rotated an amount sufficient-lyto lcause registration of the spline elements on the driver with the:grooves on the barrel member and registration of the spline .elementson the barrel member with the grooves on the driver, a threaded pinslidably mounted on said barrel member, a roller mounted on one end ofsaid pin and normally in engagement with said cam slot for maintainingsaid spline elements and grooves on the driver and barrel member in saidlongitudinal alignment and for rotating the driver a' ymember inthreaded engagement with said pin for slid- `ably moving said pin inresponse to rotation of the sleeve an amount sulliciently to move saidroller through the cam slot from said initi-al position to said finalpositiom a motor including a driving connection between said sleeve andmotor for rotating said sleeve, and means for moving said driverlongitudinal along said barrel member as the driver is rotated saidpredetermined amount.

7. A device of the class described comprising an elongated cylindricalmember, an explosive actuated member rotatable within said cylindricalmember Kfrom an initial position to an armed position and slidablelongitudinally therein when said element is in said armed position, acasing mounted on said elongated member, Ia cam slot formed in saidelement, la threaded pin slid-ably disposed within said casing Aandmovable therein a predetermined amount, a roller mounted on one end ofsaid pin and normally disposed within said cam slot for rotating saidelement from said safe position to said armed position as said rol-leris moved through said cam slot by the pin 9 10 in response to movementof the pin said predetermined' References Cited in the le of this patentamount, la sleeve rotatably mounted in said casing in UNITED STATESPATENTS threaded engagement with said pin for moving the pin l midpredetermined amount las said sleeve is rotated, driv- 1,559,183Rlfflallho OGL 27: 1925 yng means including a motor operativelyconnected to 1,799,366 Hemkel e APL 7 19,3;1 `:aid sleeve for impartingrotary movement to the Sleeve, 2,456,011 MUSSI DCC? 14: 19f8 1ndexplosive means disposed within said cylindrical mem- )er for applyingsaid predetermined amount of pressure FOREIGNIPATENTS .lg'ainst saidelement when the element is in said armed 169,919 Switzerland Sept. 1,1934 )Osition to move the element slidobly longitudinally along 10608,704 Great Britain Sept. 20, 1948 he cylindrical member.

